A RuO2IrO2 electrocatalyst with an optimal composition and novel microstructure for oxygen evolving in the single cell

• Published in: The Korean journal of chemical engineering 2022, 39(3), 264, pp.596-604
• Main Authors: Ye, Feng, Cao, Yanpeng, Han, Weiwei, Yang, Yakun, Feng, Yuancheng, Liu, Peng, Xu, Chao, Du, Xiaoze, Yang, Woochul, Liu, Guicheng
• Format: Article
• Language: English
• Subjects: Biotechnology; Carbon; Catalysis; Catalysts; Chemistry; Chemistry and Materials Science; Composition; Dendritic structure; Dip coatings; Electrocatalysts; Electrolysis; Gaseous diffusion; Immersion coating; Industrial Chemistry/Chemical Engineering; Materials Science; Oxygen evolution reactions; Reaction Engineering; Ruthenium; Substrates; 화학공학
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-021-0942-x

A highly active RuO 2 IrO 2 electrocatalyst was developed via dip-coating/calcination method for oxygen evolution reaction (OER). The catalyst on Ti substrate with a 7/3 molar ratio between Ru and Ir showed the highest electrocatalytic activity for OER among composite samples in different molar ratios. Moreover, the properties of RuO 2 IrO 2 grown on carbon paper were evaluated by proton exchange membrane water electrolysis single cell. Compared with the micron-particle structure of RuO 2 IrO 2 catalyst on the Ti substrate, the catalyst grown on the carbon paper showed a novel nano dendrite shape and can be used directly as the gas diffusion electrode. Owing to the large surface area of the catalyst, the nano dendrite-shaped RuO 2 IrO 2 catalyst exhibits excellent OER performance in the single cell. Furthermore, a cell voltage of 2.50 V is achieved under 200 mA cm −2 at 30 °C by using the optimal composition RuO 2 IrO 2 (Ru: Ir=7/3) and the commercial 20% Pt/C as anode and cathode, respectively.